diff --git a/ChangeLog b/ChangeLog
index dd581d549b..7fa2f29323 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,9 @@
-Fri Mar  6 18:46:51 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Mar  6 19:25:40 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (RUBY_LIB_VERSION_STYLE): sets full or minor style
+	  not to show RUBY_VERSION_MAJOR and so on.
+
+	* version.h (RUBY_LIB_VERSION): makes from RUBY_LIB_VERSION_STYLE.
 
 	* configure.in, Makefile.in, win32/Makefile.sub (CHDIR): cd using
 	  phisical directory.
diff --git a/configure.in b/configure.in
index 529e567c96..569deefb52 100644
--- a/configure.in
+++ b/configure.in
@@ -2136,20 +2136,23 @@ AC_ARG_WITH(ruby-version,
             [ruby_version=$withval],
             [ruby_version=full])
 unset RUBY_LIB_VERSION
+unset RUBY_LIB_VERSION_STYLE
 case "$ruby_version" in
   when(full)
-    RUBY_LIB_VERSION='STRINGIZE(RUBY_VERSION_MAJOR)"."STRINGIZE(RUBY_VERSION_MINOR)"."STRINGIZE(RUBY_VERSION_TEENY)'
+    RUBY_LIB_VERSION_STYLE='3	/* full */'
     ;;
   when(minor)
-    RUBY_LIB_VERSION='STRINGIZE(RUBY_VERSION_MAJOR)"."STRINGIZE(RUBY_VERSION_MINOR)'
+    RUBY_LIB_VERSION_STYLE='2	/* minor */'
     ;;
 esac
-if test ${RUBY_LIB_VERSION+set}; then
+if test ${RUBY_LIB_VERSION_STYLE+set}; then
     {
-    echo '#include "version.h"' 
-    echo "ruby_version=${RUBY_LIB_VERSION}"
+    echo "#define RUBY_LIB_VERSION_STYLE $RUBY_LIB_VERSION_STYLE"
+    echo '#define STRINGIZE(x) x'
+    echo '#include "version.h"'
+    echo 'ruby_version=RUBY_LIB_VERSION'
     } > conftest.c
-    ruby_version="`$CPP -I"${srcdir}" -D'STRINGIZE(x)=x' conftest.c | grep '^ruby_version='`"
+    ruby_version="`$CPP -I"${srcdir}" conftest.c | grep '^ruby_version='`"
     eval $ruby_version
 else
     RUBY_LIB_VERSION="\"${ruby_version}\""
@@ -2199,7 +2202,11 @@ case "$RUBY_VENDOR_LIB_PATH" in
 esac
 RUBY_VENDOR_LIB_PATH2='RUBY_VENDOR_LIB"/"RUBY_LIB_VERSION'
 
-AC_DEFINE_UNQUOTED(RUBY_LIB_VERSION, ${RUBY_LIB_VERSION})
+if test ${RUBY_LIB_VERSION_STYLE+set}; then
+    AC_DEFINE_UNQUOTED(RUBY_LIB_VERSION_STYLE, $RUBY_LIB_VERSION_STYLE)
+else
+    AC_DEFINE_UNQUOTED(RUBY_LIB_VERSION, [$RUBY_LIB_VERSION])
+fi
 AC_DEFINE_UNQUOTED(RUBY_LIB_PREFIX, "${RUBY_LIB_PREFIX}")
 AC_DEFINE_UNQUOTED(RUBY_LIB, ${RUBY_LIB_PATH})
 AC_DEFINE_UNQUOTED(RUBY_SITE_LIB, ${RUBY_SITE_LIB_PATH})
diff --git a/version.h b/version.h
index f998043dbd..88717e6495 100644
--- a/version.h
+++ b/version.h
@@ -24,6 +24,14 @@ RUBY_EXTERN const char ruby_copyright[];
 #define RUBY_BIRTH_MONTH 2
 #define RUBY_BIRTH_DAY 24
 
+#if !defined RUBY_LIB_VERSION && defined RUBY_LIB_VERSION_STYLE
+# if RUBY_LIB_VERSION_STYLE == 3
+#   define RUBY_LIB_VERSION STRINGIZE(RUBY_VERSION_MAJOR)"."STRINGIZE(RUBY_VERSION_MINOR)"."STRINGIZE(RUBY_VERSION_TEENY)
+# elif RUBY_LIB_VERSION_STYLE == 2
+#   define RUBY_LIB_VERSION STRINGIZE(RUBY_VERSION_MAJOR)"."STRINGIZE(RUBY_VERSION_MINOR)
+# endif
+#endif
+
 #if RUBY_PATCHLEVEL == -1
 #define RUBY_PATCHLEVEL_STR "dev"
 #else